Upgraded Vue and related libraries

What does this MR do?

Upgrades:

    "[vue](https://npmjs.com/package/vue)": "^2.5.21",
    "[vue-loader](https://npmjs.com/package/vue-loader)": "^15.5.0",
    "[vue-resource](https://npmjs.com/package/vue-resource)": "^1.5.1",
    "[vue-router](https://npmjs.com/package/vue-router)": "^3.0.2",
    "[vue-template-compiler](https://npmjs.com/package/vue-template-compiler)": "^2.5.21",
    "[vue-jest](https://npmjs.com/package/vue-jest)": "^3.0.2",

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer